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120 results about "S system" patented technology

Systems and methods for integrity certification and verification of content consumption environments

A content provider, such as a document publisher or distributor, provides, for example, protected content to a user, for consumption within a trusted user environment. By providing integrity certification and verification services, the authenticity of the content consumption environments can be verified. The content provider forwards to the user a protected version of the digital content which includes, for example, a license agreement and an integrity profile identification. The profile includes, for example, the applications and system components that are allowed to be used in conjunction with the protected content. Additionally, the content provider initiates a request for an integrity profile. This request for the integrity profile is forwarded to an integrity certification and verification device. The integrity certification and verification device can, for example, if an integrity profile does not already exist for the requested applications and/or systems components, query a content consumption system/application provider, who, for example, has supplied the system components to the user. The content consumption system/application provider returns to the integrity certification and verification device authentication information about the particular applications or system components. The authentication information allows a comparison, or integrity verification, to be made between an application and/or system component on a user's system, and the original application or system component as distributed by the content consumption system/application provider.
Owner:CONTENTGUARD HLDG

Method and apparatus for recovering encryption session keys

A method and apparatus allows a session key for a encrypted message to be recovered even if the recipient loses or forgets his private key. A session key encrypted using the public key of a party other than the intended recipient of the message is transmitted to the third party such as a certificate authority, who uses an identifier to retrieve private information known to the intended recipient of the message. The third party can compare the private information with private information provided by the party claiming to be the intended recipient. If the private information retrieved matches or nearly matches the private information provided, the third party can decrypt the session key using the third party's private key and provide the session key to the intended recipient. The intended recipient can then use the session key to decrypt the message, without making available the intended recipient's private key to any party other than the intended recipient, or storing the intended recipient's public key on the third party's system. Law enforcement agencies can intercept the message and the session key encrypted with the third party's public key and can provide to the third party a court order to retrieve the session key to decrypt the message without notifying the intended recipient.
Owner:ORACLE INT CORP

SBR (sequencing batch reactor) semi-short-distance nitrification process control method

The invention provides an SBR (sequencing batch reactor) semi-short-distance nitrification process control method, belonging to the technical field of biological sewage treatment and being applicable to semi-short-distance nitrification treatment of low-ammonia-nitrogen wastewater such as urban domestic sewage. The SBR semi-short-distance nitrification process control method comprises five stages, namely inflow stirring and inputting of initial ammonia concentration, aeration stirring, sedimentation, dewatering and standing, wherein an aerobic aeration time is calculated according to a formula ta=tCOD+0.56alphaS0/((S0-Sn)/(n-tCOD)), aeration is timely stopped, and semi-short-distance nitrification is realized, wherein concentration ratio of nitrite ions to ammonia nitrogen in yielding water is maintained to be 0.9-1.5; and process management and operation are easy, and impact resisting load of s system is high. Compared with the traditional SBR process control technique, a semi-short-distance nitrification reactor can maintain high nitrite accumulation rate more stably; and the problem that the concentration ratio of the nitrite ions to the ammonia nitrogen in the yielding water of semi-short-distance nitrification can not be controlled in a domestic sewage biological treatment technology is solved, and a necessary inflow guarantee is provided for stable operation of an autotrophic denitrification system in the urban sewage low-ammonia-nitrogen wastewater.
Owner:BEIJING UNIV OF TECH
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